<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8"> 
	<title>菜鸟教程(runoob.com)</title> 
	<link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css">  
	<script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
	<script src="http://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
	
<div class="container">
	<h2>实例</h2>
	<div class="pull-left">元素浮动到左侧</div>
	<div class="pull-right">元素浮动到右侧</div>
</div>

</body>
</html>